<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title><nav> 元素定义导航链接集合</title>
</head>
<body>

<nav>
  <a href="/html/">HTML</a> |
  <a href="/css/">CSS</a> |
  <a href="/js/">JavaScript</a> |
  <a href="/jquery/">jQuery</a>
</nav>

</body>
</html>